Add _cbson files to _cmessage sources

Author: thalassemia

setup.py

@@ -263,7 +263,12 @@ def build_extension(self, ext):
     Extension(
         "pymongo._cmessage",
         include_dirs=["bson"],
-        sources=["pymongo/_cmessagemodule.c", "bson/buffer.c"],
+        sources=[
+            "pymongo/_cmessagemodule.c",
+            "bson/_cbsonmodule.c",
+            "bson/time64.c",
+            "bson/buffer.c",
+        ],
     ),
 ]